Battery top cover structure

Abstract

The invention relates to a battery top cover structure, which is suitable for a shell battery and comprises a top cover, a first pole component, a second pole component and lower plastic, the top cover abuts against the lower plastic cement. A first pole hole is formed in one end of the top cover, and a second pole hole is formed in the other end of the top cover; a first closing opening is circumferentially formed in the side surface, far away from the lower plastic, of the first pole hole, and a second closing opening is circumferentially formed in the side surface, far away from the lower plastic, of the second pole hole; the first pole assembly is arranged in the first pole hole, and the first pole assembly is abutted against the first closing opening; and the second pole assembly is arranged in the second pole hole, and the second pole assembly is abutted against the second closing opening. The structure is simple, the performance is reliable, the production cost is greatly reduced, higher practicability and economical efficiency are achieved, and the device can be used as a universal product for production and use.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery top cover structure. Background Art

[0002] With the development of technology, power batteries, as an energy device, have attracted increasing attention and have been widely used in fields such as mobile phones, electric vehicles, and power tools.

[0003] In the conventional square lithium-ion battery or sodium-ion battery structure, there are various forms of the pole column structure of the top cover. There is an integral structure, and there is also a structure in which the pole column is independently made into a component and then welded to the top cover sheet to form a complete top cover structure. In the more widely used top cover structures, the copper part and the aluminum part of the negative pole column are friction-welded, and then the negative pole column is machined into shape; the positive pole column is completed by cold heading and machining. In the assembly stage, injection molding of PPS plastic is used to prevent the pole column from falling off and forming, and its performance is good. However, this type of top cover processing technology is complex, the manufacturing cost is high, and it is difficult to be widely used. Summary of the Invention

[0004] Based on this, the present invention provides a battery top cover structure, aiming to solve the problems of the complex pole column structure of the top cover in the prior art, high manufacturing cost, and difficulty in being widely used.

[0005] To achieve the above object, the embodiments of the present invention propose the following technical solution: A battery top cover structure, applicable to a shell battery, includes a top cover, a first pole column assembly, a second pole column assembly, and a lower plastic; the top cover abuts against the lower plastic; one end of the top cover is provided with a first pole column hole, and the other end is provided with a second pole column hole; a first closing opening is circumferentially provided on the side of the first pole column hole away from the lower plastic, and a second closing opening is circumferentially provided on the side of the second pole column hole away from the lower plastic; the first pole column assembly is disposed in the first pole column hole, and the first pole column assembly abuts against the first closing opening; the second pole column assembly is disposed in the second pole column hole, and the second pole column assembly abuts against the second closing opening.

[0006] As a preferred embodiment, in the direction from the lower plastic to the top cover, the first closing opening extends from the edge of the first pole column hole in a direction away from the top cover, and the aperture of the first closing opening gradually decreases to a minimum aperture; the plane where the minimum aperture is located is arranged parallel to the top cover.

[0007] As a preferred embodiment, in the direction from the lower plastic to the top cover, the second closing opening extends from the edge of the second pole column hole in a direction away from the top cover, and the aperture of the second closing opening gradually decreases to a minimum aperture; the plane where the minimum aperture is located is arranged parallel to the top cover.

[0008] As a preferred embodiment, the first pole assembly includes a first upper plastic, a first pole, and a first sealing ring; the first sealing ring is sleeved on the first pole, and the first sealing ring is arranged at the edge of the first pole hole, and the first pole passes through the first pole hole and abuts against the first sealing ring; the first upper plastic is injection molded on the first pole, and the first upper plastic abuts against the first closing end.

[0009] As a preferred embodiment, a first protrusion is provided at one end of the first pole away from the top cover, and the first protrusion protrudes from the first upper plastic arrangement.

[0010] As a preferred embodiment, the second pole assembly includes a second upper plastic, a second pole, and a second sealing ring; the second sealing ring is sleeved on the second pole, and the second sealing ring is arranged at the edge of the second pole hole, and the second pole passes through the second pole hole and abuts against the second sealing ring; the second upper plastic is injection molded on the second pole, and the second upper plastic abuts against the second closing end.

[0011] As a preferred embodiment, a second protrusion is provided at one end of the second pole away from the top cover, and the second protrusion protrudes from the second upper plastic arrangement.

[0012] As a preferred embodiment, a plurality of undercut holes are provided on the side of the top cover close to the lower plastic; a plurality of protrusions are provided on the side of the lower plastic close to the top cover; the protrusions are provided in a one-to-one correspondence with the undercut holes; and the protrusions are inverted in the undercut holes.

[0013] As a preferred embodiment, a plurality of the undercut holes are symmetrically arranged on both sides of the side surface of the top cover; among the undercut holes on the same side, the undercut holes at the same end are arranged at equal intervals.

[0014] As a preferred embodiment, a plurality of the protrusions are symmetrically arranged on both sides of the lower plastic side surface; among the protrusions on the same side, the protrusions at the same end are arranged at equal intervals.

[0015] As a preferred embodiment, the protrusion is matched with the undercut hole; the protrusion is a circular protrusion; and the undercut hole is a circular undercut hole.

[0016] As a preferred embodiment, an explosion-proof valve hole is provided on the top cover, and the explosion-proof valve hole is provided between the first pole hole and the second pole hole; an explosion-proof valve is provided in the explosion-proof valve hole.

[0017] As a preferred embodiment, the lower plastic also has a groove, a first hole and a second hole; the groove is arranged between the first hole and the second hole; the first hole is arranged below the first pole hole, the second hole is arranged below the second pole hole, and the groove is arranged below the explosion-proof valve hole; the first hole is arranged in a matching manner with the first pole assembly, and the second hole is arranged in a matching manner with the second pole assembly; a plurality of hollow holes are arranged in the groove.

[0018] As a preferred embodiment, the first pole assembly is a positive pole assembly, and the second pole assembly is a negative pole assembly; alternatively, the first pole assembly is a negative pole assembly, and the second pole assembly is a positive pole assembly.

[0019] As a preferred embodiment, the housing battery is a square housing battery; the square housing battery is a lithium-ion battery or a sodium-ion battery.

[0020] The beneficial effects achieved by the present invention: Through the structure of the present application, the safety performance of the battery structure can be significantly improved. It can not only effectively protect the battery, but also extend the service life of the battery and reduce the use cost. The structure of the present application is simple and the performance is reliable. Compared with similar products in the market, the structure of the present application greatly reduces the production cost on the premise of ensuring the product performance, has an obvious cost advantage, has higher practicability and economy, and can be produced and used as a general product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the overall structure of the battery top cover structure according to an embodiment of the present invention;

[0023] Figure 2 is Figure 1 the exploded structure diagram of the battery top cover structure;

[0024] Figure 3 is Figure 1 the sectional structure diagram of the battery top cover structure;

[0025] Figure 4 is Figure 2 the structure diagram of another angle of the top cover;

[0026] Figure 5 isFigure 2 Schematic diagram of the first pole column.

[0027] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In this application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Specifically, as Figures 1 to 3 shown, an embodiment of the present invention provides a battery top cover structure applicable to a shell battery, including a top cover 10, a first pole column assembly 20, a second pole column assembly 30, and a lower plastic 40; the top cover 10 abuts against the lower plastic 40; one end of the top cover 10 is provided with a first pole column hole 11, and the other end is provided with a second pole column hole 12; a first necking 111 is circumferentially arranged on the side of the first pole column hole 11 away from the lower plastic 40, and a second necking 121 is circumferentially arranged on the side of the second pole column hole 12 away from the lower plastic 40; the first pole column assembly 20 is arranged in the first pole column hole 11, and the first pole column assembly 20 abuts against the first necking 111; the second pole column assembly 30 is arranged in the second pole column hole 12, and the second pole column assembly 30 abuts against the second necking 121.

[0034] As a preferred embodiment, in the direction from the lower plastic 40 to the top cover 10, the first necking 111 extends from the edge of the first pole column hole 11 in a direction away from the top cover 10, and the aperture of the first necking 111 gradually decreases to a minimum aperture; the plane where the minimum aperture is located is arranged parallel to the top cover 10. Such a setting can effectively prevent the first pole column from falling off and is beneficial to the fixation of the first pole column.

[0035] As a preferred embodiment, in the direction from the lower plastic 40 to the top cover 10, the second necking 121 extends from the edge of the second pole column hole 12 in a direction away from the top cover 10, and the aperture of the second necking 121 gradually decreases to a minimum aperture; the plane where the minimum aperture is located is arranged parallel to the top cover 10. Such a setting can effectively prevent the second pole column from falling off and is beneficial to the fixation of the second pole column.

[0036] In the embodiment of the present application, the first necking 111 and the second necking 121 are symmetrically arranged, which is beneficial to ensuring the consistency of battery performance.

[0037] As a preferred embodiment, the first pole column assembly 20 includes a first upper plastic 21, a first pole column 22, and a first sealing ring 23; the first sealing ring 23 is sleeved on the first pole column 22, and the first sealing ring 23 is arranged at the edge of the first pole column hole 11, and the first pole column 22 passes through the first pole column hole 11 and abuts against the first sealing ring 23; the first upper plastic 21 is injection-molded on the first pole column 22, and the first upper plastic 21 abuts against the first necking 111. In this way, through the mutual cooperation of the first upper plastic and the first necking, the first pole column can be prevented from falling off, which is beneficial to the fixation of the first pole column.

[0038] As a preferred embodiment, as Figure 5 shown, a first convex portion 221 is provided at one end of the first pole column 22 away from the top cover 10, and the first convex portion 221 protrudes from the first upper plastic 21. Such a setting can effectively simplify the welding process of the positive and negative connection pieces. At the same time, with the first convex portion 221 as the protruding position, the first pole column 22 can be welded to the connection piece by welding, which is convenient and fast.

[0039] In the embodiment of the present application, the first pole column 22 further includes a first cylindrical portion 222, a first ring 223 and a second cylindrical portion 224. The first convex portion 221 is provided on the first cylindrical portion 222. The first ring 223 is sleeved on one end of the first cylindrical portion 222 close to the second cylindrical portion 224, and the first cylindrical portion 222 is provided on the second cylindrical portion 224. The first sealing ring 23 is sleeved on the outer side of the second cylindrical portion 224, and the first sealing ring 23 is respectively in contact with the first cylindrical portion 222, the first ring 223 and the second cylindrical portion 224. The first cylindrical portion 222 is in contact with the first upper plastic 21.

[0040] Similarly, in the embodiment of the present application, the second pole column 32 has a structure similar to that of the first pole column. With the structure of the present application, there is no need to greatly modify the battery structure, which is convenient for implementation and popularization. The first pole column can adopt the integral stamping forming technology and be stamped in the mold, which has the advantages of good consistency, simple manufacturing process and low cost, and is very suitable for mass production.

[0041] As a preferred embodiment, the second pole column assembly 30 includes a second upper plastic 31, a second pole column 32 and a second sealing ring 33. The second sealing ring 33 is sleeved on the second pole column 32, and the second sealing ring 33 is arranged at the edge of the second pole column hole 12. The second pole column 32 passes through the second pole column hole 12 and is in contact with the second sealing ring 33. The second upper plastic 31 is injection molded on the second pole column 32, and the second upper plastic 31 is in contact with the second necking 121. In this way, through the mutual cooperation of the second upper plastic 31 and the second necking 121, the second pole column 32 can be prevented from falling off, which is beneficial to the fixation of the second pole column 32.

[0042] As a preferred embodiment, as Figure 4 shown, a second convex portion 321 is provided at one end of the second pole column 32 away from the top cover 10, and the second convex portion 321 protrudes from the second upper plastic 31. Such a setting can effectively simplify the welding process of the positive and negative connection pieces. At the same time, with the second convex portion 321 as the protruding position, the second pole column 32 can be welded to the connection piece by welding, which is convenient and fast.

[0043] The second pole 32 is made of copper-aluminum composite material and is formed by integral stamping technology, which has the advantages of good consistency, simple manufacturing process, and low cost, and is very suitable for mass production.

[0044] As a preferred embodiment, the top cover 10 is provided with a plurality of undercut holes 13 on the side close to the lower plastic 40; the lower plastic 40 is provided with a plurality of protrusions 41 on the side close to the top cover 10; the protrusions 41 are provided in a one-to-one correspondence with the undercut holes 13; the protrusions 41 are inverted in the undercut holes 13. In the present application, the lower plastic 40 is fixed to the bottom of the top cover in an inverted manner, which is convenient and quick to fix; in other embodiments, the lower plastic is also fixed to the bottom of the top cover by ultrasonic welding.

[0045] As a preferred embodiment, the plurality of undercut holes 13 are symmetrically arranged on both sides of the side of the top cover 10; among the undercut holes 13 on the same side, the undercut holes 13 at the same end (the top cover is divided into left and right ends by the explosion-proof valve hole) are arranged at equal intervals. In this way, the top cover 10 and the lower plastic 40 are fixed more firmly and stably.

[0046] As a preferred embodiment, a plurality of protrusions 41 are symmetrically arranged on both sides of the side of the lower plastic 40; among the protrusions 41 on the same side, the protrusions 41 at the same end (the lower plastic is divided into left and right ends by the groove) are arranged at equal intervals. In this way, the top cover 10 and the lower plastic 40 are fixed more firmly and stably.

[0047] As a preferred embodiment, the protrusion 41 is matched with the undercut hole 13; the protrusion 41 is a circular protrusion; and the undercut hole 13 is a circular undercut hole. In this way, the top cover 10 and the lower plastic 40 are fixed more firmly and stably, and the manufacturing process can be simplified.

[0048] As a preferred embodiment, an explosion-proof valve hole 14 is provided on the top cover 10, and the explosion-proof valve hole 14 is provided between the first pole hole 11 and the second pole hole 12; an explosion-proof valve 50 is provided in the explosion-proof valve hole 14. In the present application, the explosion-proof valve 50 is welded to the top cover by laser welding. The explosion-proof valve can be in various forms such as round, oval, square, polygonal, etc. Specifically, in the embodiment of the present application, the explosion-proof valve is oval.

[0049] As a preferred embodiment, a groove 42, a first hole 43 and a second hole 44 are further provided on the lower plastic 40; the groove 42 is disposed between the first hole 43 and the second hole 44; the first hole 43 is disposed below the first pole hole 11, the second hole 44 is disposed below the second pole hole 12, and the groove 42 is disposed below the explosion-proof valve hole 14; the first hole 43 is adapted to the first pole assembly 20, and the second hole 44 is adapted to the second pole assembly 30; a plurality of hollow holes 421 are provided in the groove 42. In the embodiment of the present application, the plurality of hollow holes 421 are arranged at equal intervals, which is beneficial to the exertion of the function of the explosion-proof valve.

[0050] As a preferred embodiment, the first pole assembly 20 is a positive pole assembly, and the second pole assembly 30 is a negative pole assembly; or, the first pole assembly 20 is a negative pole assembly, and the second pole assembly 30 is a positive pole assembly. Specifically, in the embodiment of the present application, the first pole assembly 20 is a positive pole assembly, and the second pole assembly 30 is a negative pole assembly.

[0051] As a preferred embodiment, the housing battery is a square housing battery; the square housing battery is a lithium-ion battery or a sodium-ion battery. Specifically, in the embodiment of the present application, the square housing battery is a lithium-ion battery.

[0052] Through the structure of the present application, the safety performance of the battery structure can be significantly improved, which can not only effectively protect the battery, but also extend the service life of the battery and reduce the use cost. The structure of the present application is simple and reliable. Compared with similar products on the market, the structure of the present application greatly reduces the production cost on the premise of ensuring product performance, has obvious cost advantages, has higher practicability and economy, and can be produced and used as a general product.

[0053] In the embodiment of the present application, the housing battery is generally a square battery. The cover plate can be an aluminum cover plate or a cover plate of other materials.

[0054] In the present application, the sealing ring can be made of one material or a mixture of at least two materials selected from PP, PC, PVC, PPS, PE and PET.

[0055] The lower plastic can be processed by an injection molding method, has high precision, and has a simple and reliable structure.

[0056] In the description of this specification, the description referring to terms such as "one embodiment" and "example" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0057] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0058] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A battery top cover structure, characterized in that, Applicable to shell batteries, including a top cover, a first pole assembly, a second pole assembly and a lower plastic; the top cover abuts against the lower plastic; a first pole hole is provided at one end of the top cover, and a second pole hole is provided at the other end; a first closing opening is provided on the side circumferentially away from the lower plastic of the first pole hole, and a second closing opening is provided on the side circumferentially away from the lower plastic of the second pole hole; the first pole assembly is provided in the first pole hole, and the first pole assembly abuts against the first closing opening; the second pole assembly is provided in the second pole hole, and the second pole assembly abuts against the second closing opening.

2. The battery top cover structure according to claim 1, wherein, In the direction from the lower plastic to the top cover, the first closing opening extends from the edge of the first pole hole in a direction away from the top cover, and the aperture of the first closing opening gradually decreases to a minimum aperture; the plane where the minimum aperture is located is parallel to the top cover.

3. The battery top cover structure according to claim 1, characterized in that, In the direction from the lower plastic to the top cover, the second closing opening extends from the edge of the second pole hole in the direction away from the top cover, and the aperture of the second closing opening gradually decreases to a minimum aperture; the plane where the minimum aperture is located is parallel to the top cover.

4. The battery top cover structure according to claim 1, characterized in that, The first pole assembly includes a first upper plastic, a first pole, and a first sealing ring; the first sealing ring is sleeved on the first pole, and the first sealing ring is arranged at the edge of the first pole hole, and the first pole passes through the first pole hole and abuts against the first sealing ring; the first upper plastic is injection-molded on the first pole, and the first upper plastic abuts against the first closing end.

5. The battery top cover structure according to claim 4, characterized in that, A first protrusion is disposed at one end of the first pole away from the top cover, and the first protrusion protrudes from the first upper plastic arrangement.

6. The battery top cover structure according to claim 1, characterized in that, The second pole assembly includes a second upper plastic, a second pole, and a second sealing ring; the second sealing ring is sleeved on the second pole, and the second sealing ring is arranged at the edge of the second pole hole, and the second pole passes through the second pole hole and abuts against the second sealing ring; the second upper plastic is injection molded on the second pole, and the second upper plastic abuts against the second closing end.

7. The battery top cover structure according to claim 6, characterized in that, A second protrusion is disposed at one end of the second pole away from the top cover, and the second protrusion protrudes from the second upper plastic arrangement.

8. The battery top cover structure according to claim 1, wherein, A plurality of undercut holes are arranged on the side of the top cover close to the lower plastic; a plurality of protrusions are arranged on the side of the lower plastic close to the top cover; the protrusions are arranged in one-to-one correspondence with the undercut holes; and the protrusions are undercut in the undercut holes.

9. The battery top cover structure according to claim 8, wherein A plurality of the undercut holes are symmetrically arranged on both sides of the side surface of the top cover; among the undercut holes on the same side, the undercut holes at the same end are arranged at equal intervals; The plurality of protrusions are symmetrically arranged on both sides of the lower plastic side surface; among the protrusions on the same side, the protrusions at the same end are arranged at equal intervals.

10. The battery top cover structure according to claim 8, characterized in that, The protrusion is matched with the undercut hole; the protrusion is a circular protrusion; the undercut hole is a circular undercut hole; The first pole assembly is a positive pole assembly, and the second pole assembly is a negative pole assembly; or, the first pole assembly is a negative pole assembly, and the second pole assembly is a positive pole assembly; The housing battery is a square housing battery; the square housing battery is a lithium-ion battery or a sodium-ion battery.

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